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INFORMATION SHEET <br /> CITY OF MANTECA <br /> SAN JOAQUIN COUNTY <br /> The City of Manteca is upgrading and expanding its wastewater treatment facility <br /> for regional wastewater treatment and disposal to accept additional flows from the <br /> City and from Lathrop County Water District. The regional project will sewer the <br /> community of Lathrop, construct an interceptor to the Manteca facility, uprade <br /> treatment to secondary levels, and expand disposal capacity to 5.75 mgd ?land <br /> disposal and surface water discharge) . <br /> The modifications and additions to the existing Manteca treatment facilities <br /> consist of a new influent pump, new mechanically cleaned bar screen, new grit <br /> tanks, new primary sedimentation basins, addition of new intermediate oxidation <br /> towers and recycle pump station, expansion of the existing aeration basin, the <br /> addition of two new circular secondary clarifiers, new chlorination/dechlorination <br /> building, chlorine contact basins converted from the existing sedimentation tanks, <br /> modifications to the existing effluent disposal system and reservoir, and a new <br /> administration building. The major components of the solids handling facilities <br /> consist of a dissolved air flotation thickener to thicken secondary sludge, two <br /> anaerobic digesters, a sludge lagoon, and two sludge trucks for land disposal of <br /> liquid digested sludge. Lathrop wastewater will be collected and transported by <br /> force main to the Manteca WQCF for treatment and disposal . <br /> Land disposal of effluent will be maximized at agronomic rates on approximately <br /> 300 acres of existing irrigation fields. Soils at the site are sandy loams and <br /> loamy sands with moderately fast to fast permeabilities. Ground water is shallow, <br /> at 2 to 6 feet below the ground surface. Deeper ground water (which is hydrau- <br /> lically connected to the shallow zone) is of good quality and is used extensively <br /> for domestic and agricultural uses. Effluent in excess of disposal capacity <br /> of the irrigation fields will be discharged to the San Joaquin River starting in <br /> 1986. The City and Water District have jointly applied for an NPDES permit for <br /> this surface water discharge. <br /> The upgraded and expanded treatment plant will be located where the current <br /> facility is in Section 1, T2S, R6E, MDB&M,, along the south side of Yosemite Avenue <br /> (formerly State Highway 120) and about 2 1/2 miles west of Manteca. The discharge <br /> to the San Joaquin River will be located in Section 4, T25, R6E, MDB&M. <br /> GAR:ljl :12/20/84 <br />